镧系元素双-11-钨锰酸钾的合成与鉴定

The Preparation and Examination of Potassium twi-11-Tungstomanganate of Lanthanide Elements

本文用改进的方法首次合成出 K_(?)[Ln(MnW_(11)O_(39))_2]xH_2O(Ln=Eu,Gd,Tb,Dy).通过化学分析、离子交换、电导滴定及 IR,UV,XPS 等对合成产物进行了鉴定。在此基础上对其热性质和在溶液中的某些性质进行了研究。在 IR 谱中,其某些振动频率呈波动变化,但总的趋势是随镧系元素原子序数增加,振动频率向高波数移动。根据紫外光谱中的谱带随浓度变化实验,认为在极稀的溶液中存在配合物的水解现象.得不到稳定的镧系元素双-11-钨锰酸溶液。热分析实验表明,镧系元素双-11-钨锰酸钾比12-钨锰酸钾具有较高的热稳定性。

In this paper the complexes K_(13)[Ln(MnW_(11)O_(39))2]·xH_2O(Ln=Eu,Gd,Tb,Dy). has been first prepared by an improved method.We have examinated the synthetic product by the chemical analysis,ionic exchange, electrometic titration,IR,UV,XPS.According to these,we have studied their thermal property as well as some properties in the solution.In the IR spectra, the vibrational frequencies change in waves,but the whole tendency is that the vibrational frequency shift towards higher frequency with the lanthanide atomic number increasing.Based on the fact that the UV absorbtion positions of complexes change with different concentrations,We can concluse that they are hydrolized in rather dilute solution.One can not obtain a stable acidic solution of twi-ll-tungstomanganate of lanthanide elcments. The thermal analysis incated that the potassium twi-11-tungstomanganate of lanthanide elements had higher thermal stability then that of potassium 12-tungsto- manganate.